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  1. Custom Fit Vehicle Wiring
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  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118727
Retail:$125.91
Our Price: $66.13
You Save: 47%
Custom Fit Vehicle Wiring

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Tekonsha Trailer Hitch Wiring - 118727
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system. 1-833-496-1390 to order Tekonsha custom fit vehicle wiring part number 118727 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (245)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118727

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite power module that connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the tail lights on both the driver's side and passenger's side. You will need to remove the tail lights to access this harness.


T-One Connection Location Points Behind Tail Lights

Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.


ModuLite Power Module

A ModuLite power module is built into this T-One connector. With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118727 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included

Installation Details 118727 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118727

Average Customer Rating:  4.8 out of 5 stars   (245 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

by:

I did not receive the wiring harness or the bracket. The shipping box was torn open and those items were missing. I waited weeks for this delivery and was truly disappointed.


Comments
I can understand being disappointed with how the order was received. Customer service will reach out to you.
-- Etrailer Expert Jenny N - 09/23/2022


by:

Well, I'm an old fashioned woman so I cannot give you product specifics, but I can say my husband was and continues to be happy and satisfied with the harness. He installed it himself. We both were pleased with the efficiency of the order. If you need one, buy it from trailer!




by:
Jeep

Hitch install was super easy, but that is more of a Jeep design thing. Wiring harness had a wire that required to be hooked up to the battery, but thanks to e-trailer's video it wasn't too difficult. I always go to these guys for any trailer-related needs. Their pricing & service is unmatched!




by:

Wiring and instructions very easy to follow. Took me maybe 1 hour start to finish. Great product!




by:
2018 Jeep Grand Cherokee

Good quality products and hardware. My only complaint is the shipping policy... I got my parts in a fair amount of time, but because I didn't elect for one of the more costly shipping options, I saw my "order received" status for days and had no information on a ship date other than a potential 2+ week possible delay. I'll recommend the company and the product with this disclaimer. I appreciate the tutorial videos and the easy web site navigation. Please just get better on the shipping/processing communication.


Comments
This is a good quality product and after 1 year, I have no complaints.
Mieco - 04/30/2022


by:

I'm a mechanic at Kafferlin sales where I had the order sent to. Installing the wiring harness wasn't difficult at all. Good value, Thanks, Michael Gates




by:

This hitch arrived a day earlier than expected and was exactly as ordered. Great product at a great price. Way to go etrailer.




by:

The parts are high-quality, but the video about the harness installation was a bit misleading. The process is definitely NOT "plug and play" as claimed early in the video. The work is doable for an average joe, But it irequired me to drill two holes in the body of the car, make multiple wire splices, attach terminals, buy and use a heat gun, and to snake 15' of wire under the car around suspension and exhaust components. There is no world in which it is appropriate to call that plug n play . Need to do a better job of setting expectations. But the product and customer support are very good.




by:
2020 Jeep Grand Cherokee

Went to the Jeep dealership and they wanted $800 just to activate the trailer lights! Went to etrailer.com and got the wiring harness for less than $100! Excellent instructions and took only half an hour to install the wiring harness. Will purchase future products from them and give them lots of referrals.




by:
2020 Jeep Grand Cherokee

GREAT PRODUCT! TAILLIGHT WIRING STRAIGHT FORWARD! ONLY DIFFICULTY WAS WIRING AROUND CATALITIC CONVERTER EVERYTHING ELSE WASN'T BAD!




by:
Jeep Grand Cherokee

This set up is easy to install, and has worked perfectly the entire time. I even purchased an adapter for the original 4 pin, to use it for 7 blades, and no issues whatsoever. The fun part of course is getting the black power wire all the way to the front of the Jeep. Now I will caution that I have at 5.7L Jeep Grand Cherokee Limited and getting the black wire to the battery was a little tricky. I ended up using some fishing wire to get to the undercarriage through the hollow rectangular casing that protects the other sheathed wiring for the vehicle. I have attached a photo for simplification. The rest was as easy to install as the video showed.




by:
2018 Jeep Grand Cherokee

The T-One connector for my 2018 Jeep Grand Cherokee worked great once installed. The installation of the wiring plugs, behind the tail lights went smoothly. The power wire that had to be run from the rear left corner of the Jeep to the under hood area was more difficult. It took me over an hour to find suitable locations to secure the power wire along the under-carriage so it wouldn't get burned by hot lines and exhaust pipes. The photos in the installation instruction sheet were very blurry and dark making them useless. Fortunately the online instructions from the etrailer web site were very clear. The Draw-Tight hitch was very easy to install. I used my floor jack to raise the hitch under the Jeep, which was backed onto portable ramps. I took me about 30 minutes to install the hitch and it looks great. I have enclosed photos of the four-way plug installed on the new Draw-Tight trailer hitch. Don't forget to order the four-way plug mounting bracket (P/N: 18144) as it is not included with either the hitch or the wiring kit. I highly recommend these products.




by:

I've had my hitch for about a year now and no problems whatsoever. Great product, great company and great service.




by:

Products that come from etrailer are top notch and fit perfectly. This is the third time I have bought products from them and they ship quickly and always get advice if needed




by:
2019 Jeep Grand Cherokee

Everything fit perfectly. Also, it was very nice to have videos of my actual vehicle so that problems are quick and easy to solve.




by:

Pretty simple to install if you have a basic understanding how to wire stuff like this. Works with no issues.




by:
2018 Jeep Grand Cherokee

Excellent video to assist with installa tion.




by:

Easy to follow instructions and install ation!




by:

Very easy to set up and accurate




by:

T-One wiring Harness #118727 and Draw Tite Trailer Hitch Receiver #75699 both were easy to install and look great.




by:

Works great and it was easy to install on a 2021 Jeep Grand Cherokee.




by:
2018 Jeep Grand Cherokee

Moderate to Easy installation for a 2018 Jeep Grand Cherokee if you're a bit handy. Pick up extra zip-ties, I used twice as many zip-ties as they supplied. When running the power wire, I followed the tail light wire grouping from the rear to the engine bay and had about 1ft of wire to spare. To reach the engine bay I had to partially open the front passenger wheel weld to follow the wire grouping and run it through the wire opening.




by:

Custom fit. Easy install.




by:

The trailer wiring kit fit perfectly and it functions well.




by:
2019 Jeep Grand Cherokee

Installation took a little time, but the kit works perfectly and is as described. The online instructional video etrailer.com has on the website made install a breeze (even for an average DIY-er).



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Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

  • How to Add a Trailer Connector to a 2019 Jeep Grand Cherokee
    You can easily add a 4-flat trailer connector to your 2019 Jeep Grand Cherokee without the factory tow package, you simply need to add the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727. To install this connector you will need to plug the harness into connection points behind your Jeep's tail lights and then run a hot lead to your battery. I have added a link to a video install of this connector on a '19 Grand Cherokee for you to take a look at, as well a link...
    view full answer...
  • 4-Way Trailer Wiring Harness Recommendation for 2020 Jeep Grand Cherokee without Tow Package
    For your 2020 Jeep Grand Cherokee the trailer wiring harness you want is the Tekonsha part # 118727 as it installs easily without requiring splicing into the vehicle's wiring and also because it has a very reliable converter box which means it will last a long time and be resistant to problems due to any possible shorts in your trailer wiring. I attached an install video for this for you to check out as well.
    view full answer...
  • How to Add a Trailer Connector to 2020 Jeep Grand Cherokee
    Yes, for your 2020 Jeep Grand Cherokee we have the Tekonsha T-One Vehicle Wiring Harness # 118727 that will work perfectly. This custom harness will plug into factory ports behind the driver and passenger tail lights on the Jeep and then you will just need to run the power wire up to the battery. This will provide you with a 4-Way connector to connect with and power the trailer's basic signal lights. I have attached an installation video on the 2019 model Jeep Grand Cherokee that you...
    view full answer...
  • Trailer Wiring for 2020 Jeep Grand Cherokee without Tow Package
    Yes, for your 2020 Jeep Grand Cherokee that isn't equipped with the factory tow package, the Tekonsha T-One Vehicle Wiring Harness # 118727 will work perfectly. This custom harness is going to plug into existing ports behind the tail lights and receive power by running up a hot lead to the Jeep's battery. This will provide you with a reliable 4-Way connector to power the basic signal lights on your trailer. I have attached an installation video below that you can also check out.
    view full answer...
  • Trailer Wiring Harness Recommendation for 2020 Jeep Grand Cherokee
    The trailer wiring harness I recommend for your 2020 Jeep Grand Cherokee is the Tekonsha part # 118727 installs easily by plugging inline with the taillight connectors of your vehicle and also has a really reliable converter box as well. I attached an install video for this on a very similar 2019 Grand Cherokee.
    view full answer...
  • Trailer Wiring Recommendation for 2020 Jeep Grand Cherokee
    The best trailer wiring kit we offer for your 2020 Jeep Grand Cherokee is the Tekonsha kit part # 118727 which is very easy to install as it plugs inline with the taillight wiring of your vehicle (no splicing), and comes with the most reliable converter box we offer as well. Check out the install video I attached for more info as well.
    view full answer...
  • Trailer Wiring For A 2021 Jeep Grand Cherokee
    For your 2021 Jeep Grand Cherokee I recommend the T-One Vehicle Wiring Harness # 118727. This kit is the easiest to install and has the highest amp capacity. To install this kit, simply plug into your vehicles factory harness, and you're ready to go.
    view full answer...
  • Trailer Wiring Kit Recommendation for 2021 Jeep Grand Cherokee
    The best 4-way trailer wiring kit we have for your 2021 Jeep Grand Cherokee is the Tekonsha part # 118727 which installs very easily and has the most reliable converter box. I attached an install video for you to check out as well.
    view full answer...
  • 4-Way Wiring Harness for a 2021 Jeep Grand Cherokee w/ out a Towing Package
    Yes, we do have a wiring harness for your 2021 Jeep Grand Cherokee. It is the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118727. Tekonsha makes the most reliable wiring harnesses in the towing business. This harness plugs in behind your Jeep's rear tail lights to provide you with a 4-flat vehicle connector.
    view full answer...
  • Is There a Wiring Harness For a 2021 Jeep Grand Cherokee That Does Not Use a Powered Converter?
    There is not a harness like the T-One Vehicle Wiring Harness # 118727 that will plug into the factory tail lights on your 2021 Jeep Grand Cherokee and work without a power wire running to the battery. Your Jeep needs the powered converter as the factory wiring in your Jeep is not able to safely run additional trailer lights without risking damage to the factory wiring. For many older vehicles it was never an issue but as manufacturers today have reduced the wiring to only what is needed...
    view full answer...
  • Do I Need To Have My 2022 Jeep Grand Cherokee WK Flashed By a Dealer To Work The Trailer Lights ?
    The T-One Vehicle Wiring Harness # 118727 for your 2022 Jeep Grand Cherokee WK Laredo will not require any programming from the dealer. Since this system ties into the tail lights circuits rather than the factory to port connection.
    view full answer...
  • Where Does Power Wire of Trailer Wiring for 2018 Jeep Grand Cherokee Need to Run
    The power wire of the Tekonsha trailer wiring kit part # 118727 needs to run to the battery of the vehicle so for your 2018 Jeep Grand Cherokee you'd need to run it to the battery under the seat. Check out the install video link I attached for more info.
    view full answer...
  • Will Installing a T-one Vehicle Wiring Harness With Module Drain the Battery?
    You are perfectly fine to install this on your 2021 Jeep Grand Cherokee. The power wire runs to the module in the wiring harness. The module acts as a relay which your vehicle has lots of that don't run down the battery unless they are being used. When you activate your brake lights or signals the module senses their activation and sends power from your battery to control the lights on the trailer. This helps to prevent drawing to much power from the vehicles electrical wires that may cause...
    view full answer...
  • Will A Tekonsha 118727 Wiring Harness Work With The Start/Stop Feature On A 2021 Jeep Grand Cherokee
    I looked around quite a bit, but I couldn't find anything about a trailer wiring harness affecting or being affected by the start/stop feature on your 2021 Jeep Grand Cherokee X without the tow package. With that said, we have installed the Tekonsha # 118727 on 5 Grand Cherokees to date and not had a single issue with it. I included the most recent one we did on a 2020 for you to check out as well.
    view full answer...
  • Best Wiring Harness for a 2021 Jeep Grand Cherokee without a Tow Package
    Yes, I do have a wiring harness for your 2021 Jeep Grand Cherokee without a tow package. You need the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118727. This custom-fit T-One connector plugs into your Cherokee's wiring harness behind the rear tail lights. This harness will give you a 4-flat connector that will allow you to control your trailer's lighting functions.
    view full answer...
  • Trailer Wiring Recommendation for 2014 Jeep Grand Cherokee that Does Not Need to Be Activated
    I have an easy solution that will take care of your trailer wiring on your 2014 Jeep Grand Cherokee with the Tekonsha kit part # 118727. This installs by plugging inline with the taillight connectors of the vehicle and does not integrate with any of the factory wiring so you wouldn't have to go to a dealer or worry about any of their packages being active. I attached an install video for this for you to check out as well.
    view full answer...
  • Will The Tekonsha Wiring Harness Installed On 2019 Jeep Grand Cherokee Void The Warranty
    As long as Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118727 is installed properly the wiring will not void your warranty. You are protected under the Magnuson–Moss Warranty Act which states that manufactures cannot void the warranty of a vehicle simply because of an after-market part unless that part caused the issue. The Tekonsha T-One wiring harness is a custom fit harness for your vehicle so it does not require splicing into the vehicle's electrical...
    view full answer...
  • Does Trailer Wiring for 2019 Jeep Grand Cherokee Require Running Wire to Battery
    In order to protect the wiring of your leased 2019 Jeep Grand Cherokee I have to recommend you run the power wire of the kit to your vehicle battery. Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need a setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits....
    view full answer...
  • Trailer Wiring Recommendation for 2016 Jeep Grand Cherokee without Tow Package
    For trailer wiring that is confirmed as a fit for your 2016 Jeep Grand Cherokee that does not require ECU flashing we have the T-One kit part # 118727 which will install by plugging inline with the factory taillight harnesses your vehicle has currently and does not require an ECU flash. I attached an install video for this harness for you to check out as well.
    view full answer...
  • Recommended 4-Way Trailer Wiring Harness for 2019 Jeep Grand Cherokee
    Since your 2019 Jeep Grand Cherokee isn't equipped with the factory US Car connector under the bumper then your best option for adding the needed 4-Way harness is with the Tekonsha T-One # 118727. This is still a custom harness that installs by simply plugging into factory ports behind the driver and passenger side tail lights (you will need to remove the tail lights to access the harness). Then as you mentioned, the hot lead will need to be run up to the Jeep's battery. When this type...
    view full answer...
  • 4-Pole Trailer Wiring Harness Installation in 2015 Grand Cherokee Without Factory Tow Package
    The Tekonsha 4-Pole Vehicle Wiring Harness # 118727 is a confirmed fit on your 2015 Jeep Grand Cherokee without factory tow package. The written instructions are linked along with a helpful article that will aid your installation. Once you have installed the harness according to the instructions it will not be necessary to have your dealership flash the computer, according to my contact at Tekonsha.
    view full answer...
  • 4-Way Trailer Wiring Harness Recommendation for 2016 Jeep Grand Cherokee
    Most likely your 2016 Jeep Grand Cherokee comes with a trailer wiring harness installed, but in case it does not we have the Tekonsha kit part # 118727 which is a confirmed fit. This harness is listed as a fit for your vehicle for if it did not have factory wiring so there wouldn't be a need for this harness if all Grand Cherokees of this generation came from the factory with wiring.
    view full answer...
  • Recommended 4-Way Trailer Wiring Harness For 2016 Jeep Grand Cherokee
    For you 2016 Jeep Grand Cherokee, I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727. This will plug into the factory wiring behind your tail lights with quick connects that simply snap into place and will give you the 4-way trailer connector without thinking about the dealership except to imagine the money you saved. This wiring harness has a powered ModuLite that prevents overloading your vehicle's electrical system. I've attached an article...
    view full answer...
  • 2018 Grand Cherokee Limited Trailer Wiring Recommendation
    Yes, for your 2018 Jeep Grand Cherokee Limited the T-One trailer wiring kit part # 118727 that you referenced is the correct kit you need. Since you do not have the factory tow package wiring this kit is what you need since it allows you to tap into the vehicle's wiring by installing inline with the vehicle taillight wiring. This kit also has our most reliable converter box too which is why we recommend it so highly.
    view full answer...


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